build: update minimum Xcode version for macOS

Update the minimum Xcode version for macOS to 10. We'll
need this level to incorporate future V8 versions.

Refs: https://github.com/nodejs/node/pull/29493

PR-URL: https://github.com/nodejs/node/pull/29622


Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Rod Vagg <rod@vagg.org>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Beth Griggs <Bethany.Griggs@uk.ibm.com>